Air-feed-controlling device



July 6 1926. 1,591,375 c, c. HANSEN I v AIR FEED CONTROLLING DEVICE Filed June 20, 1925 INVENTOR. Ck arias CHmzJm.

Patented July 6, 1926.

'1 "UNITED: STATES PAT NT .omc E;

CHARLES ogmusnnfor El s'roN rENnsYLvAnm, AssIG'Non TO rnGERsoLL-ru nn comrAnY, or anrasnr cI'rY, NEW JEnsnY, A CORPORATION or nnw JERSEY.

AIR-FEED-CONTROLLING DEVICE] a Application filed June 20, 1925. Serial No; 38,443.

This" invention relates to fluid actuated rock drills, and more particularly to 'afeed controlling device for the feeding element ofrock. drills of the stoper type.

'An object of this invention is to enable the feeding'element of a stoper type rock Laccordance with the practice of the inven v drill to: be controlled in asimple and improved manner. 7 t

Another' object is to insure perfect seating, rofthe valve: which controls the release of pressure fluid from the-air feeding Ielement anda further object is to improve generally f infeed controlling devices for rock drillsin order to insure ease'and simplicity of operation and certaintyof functioning.

1 Other objects willpbe in partobvious'and in part pointed outhereinafter; I -.The ,invention consists of the s I combinations of elements, features ofconstruction and arrangement lof'parts havingfthe general mode of operation substantiallyas hereinafter described; and more particularly pointed out in the appended claims andil- ,lustrated in the 'accompanying drawings, in

which- .7; Figure1 (1s a view, in elevation partly, broken away: of a stoper type rock drill showing the relation of the feed. controlling feeding cylinder for immediate pressure val 1 mechanism. with the feeding element,

feed a controlling mechanism constructed .in

tion, and in which the valve is closed,"

lookingin-the direction ofthe arrows.

- Referring'to the drawing, the invention is shown embodied in a rock drill of the stoper type having a cylinder A and a back head B. A front head C is supported by the cylinder at its front end and is secured thereto by means of spring pressed side bolts D.' Disposed within the front head C is a drill steel E and a motor (not shown) operative in a motor casing F imparts rotary motion to the drill steel E to keep said steel free within "the drill hole.

In order to movethe drill forwardly as the drillsteel E penetrates the work, a feedelement is provided. In this instance,

throttle valve I, Figurefiis aview similar' to Figure 2 showing the cooperationof the parts; for

openlng the valve,.and r,

inder G, and a piston H-arrangedto reciprocate within thecylinder G carries a piston r rod- J I to which is securedat its outer end'a' rock engagin pointer K. Inthis instance, in

the cylinder ,themotor casingF the back dareheld'. in operativelrelation with respect .toeach head B and the feeding cylinder other by means of bolts-L arranged' on opposite-sidesof the'drill.

'Pressure fluid for actuating the percussive and feeding elements is suppliedto the drill, through a suitable connection 0 se-- cured to the back head B. The admission of pressure fluid to the cylinders and to the gear: motor 1.is1 cont'rolled, ,by a suitable (not shown) "having a throttlelever i,

In order to preventlrotation of the drill with the drill steel, a rotation handle Qvv is secured to the back head B and held against removal therefrom by a nut R. A passage S is formed through the handle Q and .is in communication with thefeeding cylinder G through a passage- T formed in theiback head.

Suitable means are provided .for regulating the maximum exhaust from the pressure ues', and to this end, a plug U: is'secured in a recess V at the endof .the rotation handle Q, :andhas a restricted, passageEW; A

needle valve X screwed into the-end of the recess V controls the size-of the outletopen- 7 'ing of the passage W and is preferably providedwith a nut Y for locking the valve inposition. 4 i 1 In accordance with the present invention,

an extension Z,: which is in this instance.

formed integrally withthe rotation handle Q, is arranged at an angle with respectto said rotation handle and is provided'withjai passage Z) communicating at its inner'end with the recess V. The free end of the extension Z is in this instance screw threaded at at a to receive a suitable'nut d; A look" washer e is interposed between the nut and a shoulder f for'preventing accidental removal of the nut. The outlet-opening of the passage 7) is preferably countersunk concentrically with saidpassage to provide a seat 9 for a needle valve h which controls the exhaust of pressure fluid throughthe ro-; tation handle from the feed cylinder.

Arranged slidahly' on the extension Z is a sleeve la having a plurality of inwardly ex? tending ribs .0' to cooperate with grooves 12 formed on the extension Z to prevent rotation of the sleeve with respect to said extension, but permitting longitudinal movement of said sleeve. The outer end of the sleeve 76 is in this instance screw threaded as at g to receive a sleeve nut a An, enlarged bore 8 is formed at the outer end of the sleeve holding the sleeve in a normally upward position. V The sleeve nut 1 IS in this instance pro- 7 vided witha bore o to receive slidaloly a flange w formed integrally with thevalve h. I

The flange'w is preferably of somewhat larger diameter than the bore a to enable a shoultween when the sleeve 7a andthe valve h are dorm-of the sleeve is to engagesaid flange for opening the valve h. v The face or the flange 44} and the shoulder as are so positioned that considerable space y jemsts therehein their normal resting positions. Holes 2 and 2 are formed in the valve h and the sleeve nut 1" respectively to provide a path for pressure fluid'exhausted from the teeding element to atmosphere, In order to hold the valve it yieldinglyupon its seat 9,

a spring 3 is interposed between the end wallof the sleeve nut 1" and the said valve, and

is preferably held central with respect to' the valve bymeansof a projection e tol-med V coaxially with the valve,

In the operation of the device, whenever V the drill steelencounters a soft spot in the" material being drilled, ite'niay :be desirable to reduce the pressure in the air teeding element somewhat' This may he accomplished by moving the sleeve k downwardly on the extension Z until the shoulder a: bears against the flange w of the valve 'h.

Gontinued downward movement of the sleeve will unseat the valve,'and a portion of the pressure fluid from the air feeding cylinder H is exhausted through the rotation handle to atmosphere throughthe ports .2 and 2 in the-valve 7i and the sleeve nut 9 respectively.

In this manner the drill may the fed slowly into the work, or, if desired, t e den may he withdrawn somewhat from the work by opening thevalve hrto wide 'limitsand per 1 machine. sleeve Z: to receive a spring t interposed between the net ,0? and ashonlder u of the I claim: a 1. In a teed controllhigldevice for rock drills, the combination of a percussive cylinder and an air feeding element, a back head for the cylinder, a rotation handle secured to the'ihac'k head and having a passage theretlll-ongh, a valve 7 seat formed at oneend of sail-passage, a valve to normally rest on said seat, a sleeve slidable on the handle for opening the valve, said sleeve being nom nally out ol'contact'with the valve, and aspi ing 1 2. In a feed controlting device; for rock. drills, the combination of a percussive cylin-V for closing Said valve;

from the der and an air feeding element, a hack head for the cylinder, a rotation handle secured to the-back head and having .a passage there through, a valve seat at the outletend of said passage, a needle valve to normally rest on said seat, a sleeve .slidable on the handle 'fovguid-ing and opening the valve, a spring for closing the valve, and a spring cooperating with the sleeve and the handle for moving the sleeve in one direction;

In lal'eed eon-trolling device for rock drills, the combination of a percussive cylinder and an :air feeding element, a back head for the cylinder, a rotationhandle secured to the hack head and having a passagetherethrough communicating at one end with the said cylinder, a valve seat at the outlet 7 opening of the passage, a needle valve normally'resting on said seat, :a isleeve slidin a normally upward position, a spring between the vvalve and the end of the sleeve to hold the valve normally closed; and cooperating ribs on the handle and the sleeve for.

preventing rotation O'fllJhG sleeve, 7

In testimony whereof I have signedthis specification V C ARLES-1o;

' able-on the handle for centralizing and open v ing thevalve, a spring for holdingthe sleeve" 

